Tamping machine



Patented Nov. 26, 1940 i PATENT OFFICE TAMPING MACHINE Karl Beierlein, Dusseldorf, Germany, assignor lto Losenhausenwerk Dsseldorfer Maschinenbau A. G., Dusseldorf-Grafenberg, Germany, a corporation of Germany Application July 2c, 1937, serial No. 155,834 In Germany September 1 4, 1936 3 Claims.

This invention relates to a tamping machine and its primary object is to make a machine of this kind which can be more easily handled and is more efficient than such machines have been heretofore.

The operation of early tamping machines has been interfered with by a tendency to dance, rendering many of the impulses ineffective and making the machine difficult to handle. This tendency is controlled by connecting the vibrating part of the machine by springs to a heavy stabilizing mass, the said vibrating part being relatively light.

In accordance with one featureof this invention the arrangement described is secured'by utilizing the motor which drives the impulse device as a substantial part of the stabilizing mass.

In accordance with another feature of the invention a progressive movement can be imparted to the machine by changing the angleof the direction of the impulses and the speed and direction of this movement of the machincan Ibe controlled by manipulative means mounted upon the stabilizing part of the machine. The transmission ofthe forces for controlling the speed of movement of theI machine may be taken care of by the interposition of elastic devices, such as springs between the manipulative means and the impulse device. For controlling the direction of movement of the machine thestabilizing part of the machine can also be connected to the vibrating part by elastic means, such as springs, to maintain a more or less constant relative angular position in the horizontal plane.

In accordance with another feature of the invention the massive stabilizing part of the machine and the vibrating part, for instance the tamping plate, can be so formed that a easing of the former part overhangs a flange, or the like,

upon the latter part. y

By the described arrangement 'of the motor upon the stabilizing part of the machine several advantages'are achieved. The weight of the v1- brating parts, and therewith the weight of the whole machine, are considerably reduced, while the motor is protected against harmful vibrations. Furthermore, the possibility is presented 1 of mounting all the handles required for controlling the driving means of the machine upon the stabilizing part, which is relatively still. The proposed means for transmitting the controlling forces for the speed and directionof movement of the machine make it lpossible to mount not only the aforesaid control members, but all the control members upon the relatively quiet part of l the machine. Finally, the interengaging arrangement of the two parts aifords a protection against penetration of dirt into the vulnerable driving mechanism,` which is a very yimportant desideratum in this type of machine. -l One illustrative form ofthe invention is shown in the drawing.

Fig. l is a vertical section, while Fig. 2 is a plan view with the upper part of the casing removed andlpart of the engine base plate broken away.

The ground plate which rests upon the matei rial to be compacted is indicated at I. I In a bear.- in'g 2 on the top of this yplate is pivotally supported an impulse generating device 3 comprising acasing' 4 containing two rotary unbalanced weights 5 and 6. These weights are fixed to shafts I and 8 geared together by meshing pinions 9 and I0. The weights are rotated by a driving mechanism to be presently described and are made to rotate oppositely by the intermeshing pinions 9 and IU, so that lateral forces generated by the weights are balanced, while forces in the direction tangent to the pitch .Y circles of the pinions 9 and IIJ are unbalanced. This type of impulse generating mechanism is well known per se. By means of springs II there is mounted on the ground plate I a `base plate I2 for a driving `motor I3. A pulley I4 on the shaft I5 of the motor is connected by an elasticl belt It to a pulley Il mounted by a shaft I8 upon the casing 4 of the impulse generating device. The opposite end of shaft I8 has fixed to it a pulley I9 connected by a belt 20 with a pulley 2| on shaft l.

'Ihe described pulleys and belts constitute the power transmission mechanism by which the motor drives the impulse generating device.

The driving motor I3 forms a considerable part, if not the greatest part, of the sprung mass of the machine. par-t, preferably upon the base plate I2, is mounted a manipulative device for controlling the speed and direction of movement of the machine. Preferably this manipulative device is in the form of a steering column 22 fixed to a support 23 and containing a shaft 24 which can Upon the sprung or stabilizing be rotated by a handwheel 25. The shaft 24 is connected by a universal joint 26 with a screw spindle 21 mounted in bearings 28 and/29 upon the base plate I2. 2l and is connected by springs 3l with an ear 32 .on the housing 4 of the impulse device. By turning the yhandwheel 25l the impulse device can be made to rock upon its bearing 2 to change the inclination ofthe impulses. In thisI way a A nut 30 travels upon spindle lit `simple adjustment ofthe direction of applica- 'tion of the force ot the impulse device, and thereby of the speed of forward movementfof the' machine is` provided for. The stabilizing part of the machine is furthermore connected with the vibrating part by springs 33, stretched between eyes 34 on a downwardly"y extending skirt 35 of base plate I2 to eyes 36 on the ground plate I; These springs 33 control-'the relative rotation ofthe two parts of the machine in the "horizontal plane and in this way lateral movement of the steering column 22 turns not only lthe sprung upper part of the machine, but in thecourseof the vibrating movements also the under part resting upon the earth, thereby setting the underpart in the desired direction for g its progressing movement. Finally, the whole 1 upper part of the machine is preferably covered by a hood, one portion of which is constituted by the skirt 35 ofthe plate |2,"Whi1e the upper portion is formed by a cap y31. ,This capcan be easily removed byunfastening clips 38 pivoted 4to tle skirt 35 at 39 and engaging other pins 40 on the cap 31. The skirt 35 overhangs la flange 4I extending u'p from the groundplate l,

these parts cooperating to prevent-penetrationv r of dirt, orthe like, 'into the machine, while allowing free relative motion in accordance with the vibrations generated by the impulse device.

I claim:

l. A tamping machine comprising a vibrating ground engaging part and a relatively massive stabilizing part, springs supporting said stabiliz- .ing part on said ground engaging part, said lative means on said stabilizing part, and spring connections between said manipulative means and said impulse generating means for adjusting the latter. y

1 2. A'tamping machine comprising a vibrating ground engaging part and a. relativelymassive stabilizing part, springs supporting said-stabiliz Ving part 'on said ground engaging. part, said springs having a characteristic such as to permit a relative movement of considerable amplitude between said two parts of the machine, said vibrating part comprising an limpulse generating device, said stabilizing; partcomprising, as a preponderant part of its mass, a motor located directly. above said impulse generating device, `elastic driving connections between said motor and said impulse generating device, spring connections between said stabilizing part and said` vibrating part adapted yieldingly to resist relative angular movement of said parts in a, horizontal Awhereby it canbe turned horizontally to cause said vibrating part to of said spring connections.

3.A tamping machine'comprising a vibrating ground engaging part and a relatively massive stabilizingpart, springs supporting said stabilizing part on said ground engaging part, saidv springs having a characteristic such as to per-vv mit a relative vmovement of considerable amplitude between said, two .parts of the machine, said vibrating part comprising an impulse generating device, said stabilizing part comprising,

as a preponderant par-t of its mass, a motor located directly above said impulse generating device, elastic driving connections between said motor and said impulse generating device, a skirton said stabilizing pa-rt extending downward around said supporting springs and` said impulse generating device, and a flange on said lvibrating `part surrounding` said supporting springs and saidl impulse .generating device and extending up inside said skirt. f

' KARL BEIERLEIN.

' plane, and a handle on said stabilizingA part Aturn through: the action 

